code: def perdict(frontend_url, request_str):
      httpx.post(frontend_url + "/predict", data=request_str)
  
imports: import redis
  import time
  from bigdl.serving.schema import *
  import httpx
  import json
  import uuid
  from bigdl.serving.log4Error import invalidInputError
label_desc: Use image node_id 3 for calling a global function with example usage: perdict(frontend_url, request_str) without return types